CVE-2020-25820
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF...
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
- Record
CVE-2020-25820- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:P/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
CVE List No score
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
- Record
CVE-2020-25820- Updated
- 2026-11-02
EUVDEUVD-2020-18456 No score
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
- Record
EUVD-2020-18456- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5mrj-23w8-w7hx No score
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF...
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
- Record
GHSA-5mrj-23w8-w7hx- Weakness
- CWE-918
- Updated
- 2026-11-02
OSV
BigBlueButton before 2.2.7 allows remote authenticated users to read local files and conduct SSRF attacks via an uploaded Office document that has a crafted URL in an ODF xlink field.
- Record
CVE-2020-25820- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | BigBlueButton 2.2.25 - Arbitrary File Disclosure and Server-Side Request Forgery | 2020-11-18 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-25820 is a medium vulnerability (CVSS 6.5) in Bigbluebutton, published October 21, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 10.5%, the 95th percentile. No source names a fixed version.
References
redteam-pentesting.de/advisories/rt-sa-2020-005
golem.de/news/big-blue-button-das-grosse-blaue-sicherheitsrisiko-2010-151610.html
packetstormsecurity.com/files/159667/BigBlueButton-2.2.25-File-Disclosure-Server-Side-Request-Forgery.html
github.com/bigbluebutton/bigbluebutton/commit/71fe1eac1e5bd73a2cd44bd79c001086b250e435
nvd.nist.gov/vuln/detail/CVE-2020-25820